CST3240概述:
The CST3240 series multi point capacitive touch chip supports single-layer, multi-layer modules, and multiple patterns. It adopts multiple high-voltage drives above 7V to achieve high-performance, high sensitivity, and realistic multi finger touch effects. Compared to traditional single channel low-voltage drives, it can provide higher signal-to-noise ratio and anti-interference ability. At the same time, the chip‘s internal self integrating capacitive sensing module, combined with intelligent scanning algorithms, achieves fast response while also exhibiting excellent noise resistance, waterproofing, and low power consumption performance.
The CST3240 series multi point capacitive touch chip supports single-layer, multi-layer modules, and multiple patterns. It adopts multiple high-voltage drives above 7V to achieve high-performance, high sensitivity, and realistic multi finger touch effects. Compared to traditional single channel low-voltage drives, it can provide higher signal-to-noise ratio and anti-interference ability. At the same time, the chip‘s internal self integrating capacitive sensing module, combined with intelligent scanning algorithms, achieves fast response while also exhibiting excellent noise resistance, waterproofing, and low power consumption performance.
CST3240系列多点电容触控芯片,支持单层,多层模组及多种图案,采用多路 7V 以上高压驱动,实现高性能,高灵敏度真实多指触摸效果。相较传统的单路低压驱动可提供更高的信噪比和抗干扰能力。同时,芯片内部自互一体电容感应模块,结合智能扫描算法,在实现快速反应的同时,具有优异的抗噪、防水、低功耗表现。
CST3240特性:
高性能电容检测电路及DSP模块
自互一体检测模块;
多路高压同时驱动,实现高灵敏度,高信噪比采样;
动态宽范围跳频技术,支持更强的抗干扰能力;
支持被动电容触摸笔;
支持待机手势唤醒功能;
支持在线编程;
内置看门狗;
多个按键支持。
性能指标
典型刷新率 100Hz;
带水操作,大拇指识别及大手掌抑制;
动态模式下典型功耗:10mA;
监控模式下典型功耗:4mA(30Hz);
睡眠模式下典型功耗:20uA。
电容屏支持
最多支持 40 个驱动/感应通道,并支持TX/RX 互换;
通道悬空/下拉设计支持;
支持传统的 DITO 和 SITO 及各种图案;
模组参数自动调校,最大支持阻抗达 60K;
Cover Lens 厚度支持,玻璃<= 2mm 亚克力<=1mm。
通讯接口
I2C 主/从通讯接口,速率 50Khz~400Khz可配置;
GPIO 支持,多种工作模式可配,内置上拉电阻模式;
内置 1.8V LDO,兼容 1.8V/VDDA 接口电平可配。
电源供电
单电源供电 2.8~3.6V,请参考电路设计,电源纹波<=50mv; 少量的外围器件。
封装类型:QFN52L 6*6
CST3240应用:
手机,平板,笔记本,触摸板等。
CST3240典型应用电路图:
C1:2.2uF/10V C2: 1uF/10V
C3:100nF/10V C4: 1uF/10V
VDDIO:VDDA或者VCC18,根据IIC、SPI通讯及RSTn电压决定。
R1/R2: I2C 总线上拉电阻,也可配置芯片内部5K上拉电阻代替。
GPIO:可作为INT,也可作为SensorID配置悬空或者接GND。
CST3240引脚排列:
CST3240引脚描述:
CST3240订购信息:
CST3240订购信息:
料号
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封装
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表面印字
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包装
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CST3240
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QFN52L 6*6
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CST3240
XXXXX
(生产跟踪码)
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4000/盘,编带出货
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CST3240功能框图: